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Detection of Potential GDF6 Regulatory Elements by Multispecies Sequence Comparisons and Identification of a Skeletal Joint Enhancer

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Detection of Potential GDF6 Regulatory Elements by Multispecies Sequence Comparisons and Identification of a Skeletal Joint Enhancer Genomics 86 (2005) 295 – 305 www.elsevier.com/locate/ygeno Detection of potential GDF6 regulatory elements by multispecies sequence comparisons and identification of a skeletal joint enhancer Matthew E. Portnoya, Kelly J. McDermottb, Anthony Antonellisa, Elliott H. Marguliesa, Arjun B. Prasada, NISC Comparative Sequencing Programa,c, David M. Kingsleyd, Eric D. Greena,c, Douglas P. Mortlockb,* aGenome Technology Branch, National Human Genome Research Institute, National Institutes of Health, Bethesda, MD 20892, USA bDepartment of Molecular Physiology and Biophysics, Vanderbilt University School of Medicine, Nashville, TN 37232, USA cNIH Intramural Sequencing Center (NISC), National Human Genome Research Institute, National Institutes of Health, Bethesda, MD 20892, USA dDepartment of Developmental Biology, Stanford University School of Medicine, Stanford, CA 94305, USA Received 21 March 2005; accepted 24 May 2005 Available online 24 June 2005 Abstract The identification of noncoding functional elements within vertebrate genomes, such as those that regulate gene expression, is a major challenge. Comparisons of orthologous sequences from multiple species are effective at detecting highly conserved regions and can reveal potential regulatory sequences. The GDF6 gene controls developmental patterning of skeletal joints and is associated with numerous, distant cis-acting regulatory elements. Using sequence data from 14 vertebrate species, we performed novel multispecies comparative analyses to detect highly conserved sequences flanking GDF6. The complementary tools WebMCS and ExactPlus identified a series of multispecies conserved sequences (MCSs). Of particular interest are MCSs within noncoding regions previously shown to contain GDF6 regulatory elements. A previously reported conserved sequence at À64 kb was also detected by both WebMCS and ExactPlus. Analysis of LacZ- reporter transgenic mice revealed that a 440-bp segment from this region contains an enhancer for Gdf6 expression in developing proximal limb joints. Several other MCSs represent candidate GDF6 regulatory elements; many of these are not conserved in fish or frog, but are strongly conserved in mammals. D 2005 Elsevier Inc. All rights reserved. Keywords: Gdf6; Enhancer elements; Bacterial artificial chromosome; Transgenes; Sequence analysis The use of comparative sequence analysis for identifying limited. There is often too much aligning sequence between the functional portions of complex genomes has great pairs of closely related species, forcing the use of somewhat potential for facilitating the detection of noncoding functional arbitrary thresholds (e.g., >70% identity across 100 bp). elements. Pair-wise sequence alignments and comparisons Meanwhile, there is often too little aligning sequence can be used for this purpose, for example, by simply assessing between pairs of more distantly related species, especially the percentage sequence identity across windows of a defined within noncoding regions. To overcome the limitations of size [1]. Such approaches have proven effective at identifying simple pair-wise analyses, approaches for performing multi- cis-acting regulatory sequences, including those associated species sequence comparisons have been developed [5–7]; with developmentally regulated vertebrate genes, which tend these provide a more powerful means of identifying the most to have multiple, distantly located regulatory elements [2–4]. highly conserved genomic regions. It is thus of great interest However, the use of pair-wise sequence comparisons is to apply these new approaches for studying genomic regions thought to contain complex, cis-acting regulatory elements. * Corresponding author. Fax: +1 615 343 8619. GDF6 is a member of the BMP (bone morphogenetic E-mail address: [email protected] (D.P. Mortlock). protein) gene family, a group of genes that encode secreted 0888-7543/$ - see front matter D 2005 Elsevier Inc. All rights reserved. doi:10.1016/j.ygeno.2005.05.003 296 M.E. Portnoy et al. / Genomics 86 (2005) 295–305 signaling factors. Like other BMP genes, GDF6 is Using the previously established sequence of this BAC as a expressed in many anatomical locations during embryonic reference, we have generated (¨2.7 Mb) or obtained (¨1.5 development, including numerous skeletal joints [8,9], and Mb) sequences of the orthologous genomic regions from 13 it is required for normal formation of limb, ear, and skull additional vertebrates (Fig. 1a). A previous PipMaker joints [9]. These findings are consistent with the known analysis of the mammalian GDF6 sequences has been roles of BMP members in mediating many developmental described [16]. To examine the degree of noncoding processes, such as the regional control of bone growth and conservation in other vertebrates, we obtained sequences shape [8,10,11] and soft tissue development [12,13].As from additional species and performed MultiPipMaker with other developmentally important genes, the localized analysis on the entire data set. For nine species (chimpan- effects of BMPs seem to be largely controlled by modular zee, baboon, cow, pig, cat, dog, rat, platypus, and ze- arrangements of cis-acting regulatory sequences that control brafish), appropriate BACs were isolated and sequenced the expression of BMP genes in specific anatomical as previously described [16,17]. For four species (human, locations. These regulatory sequences can reside far away chicken, Fugu, and Xenopus), the orthologous sequence from the gene [14,15]; for example, mouse bacterial was obtained from the whole-genome sequence assembles artificial chromosome (BAC)-transgene studies revealed available at the UCSC Genome Browser (http://genome. that regulatory sequences are distributed across a region of ucsc.edu/) [18]. more than 100 kb encompassing the GDF6 gene and that Pair-wise alignments were generated between the mouse these elements mediate GDF6 transcription in limb joints, reference sequence and each of the other species’ sequences digits, retina, genitalia, laryngeal cartilages, skull bones, and using BLASTZ [19], with the results visualized using other tissues [4]. MultiPipMaker [20]. Sequence coverage of the region To localize and identify further individual GDF6 cis- immediately encompassing Gdf6 was nearly complete for acting regulatory elements, we performed extensive multi- most species, with minor exceptions (Fig. 1b). The two species sequence comparisons. Previously, we performed GDF6 exons are highly conserved across vertebrates, as are pair-wise comparisons using PipMaker to indicate con- several intronic noncoding regions (Fig. 1b). As reported served GDF6 sequences [16]. Here, we describe the use of previously [16] much of the noncoding DNA flanking the two multispecies comparative approaches for detecting GDF6 gene is conserved among mammals. However, a highly conserved regions in and around GDF6. These more limited set of flanking regions is also conserved in methods detect a developmentally regulated GDF6 chicken and Xenopus. The mouse–zebrafish and mouse– enhancer that can direct gene expression in proximal limb Fugu alignments in regions flanking GDF6 appear to be joints in vivo. Our findings suggest that multispecies spurious (i.e., related to simple repeat-like sequences; data conserved sequence (MCS) analysis may be a sensitive not shown); however, true mouse–fish conserved ortholo- approach for detecting other GDF6 regulatory elements. gous sequences were found within the GDF6 exons and intron. Results WebMCS and ExactPlus analyses Multispecies sequences and alignments Since MultiPipMaker essentially displays separate pair- wise comparisons, we then performed two multispecies The 209-kb mouse BAC clone RPCI23-117O7 contains comparative analyses (WebMCS and ExactPlus) to priori- the entire Gdf6 gene and extensive flanking regions [4]. tize conserved regions by assessing multiple alignments Fig. 1. Multispecies comparative sequence analysis of the genomic region encompassing GDF6. (a) Venn diagram showing the major cladistic relationships of the vertebrate species whose sequences were analyzed. (b) A low-resolution overview of MultiPipMaker analysis of the GDF6-containing sequences from 14 species, with the mouse sequence used as the reference. The horizontal colored bars at the top of the overview plot (red, yellow, green, blue, and magenta) indicate positions of five contiguous genomic regions in mouse that were previously identified by BAC-transgene analysis to contain different subsets of tissue- specific Gdf6 regulatory enhancers [4]. The relative positions and orientations of mouse Gdf6 and two pseudogenes (Uqcrb and Gapdh) are indicated, as is the 2.9-kb interval previously shown to contain a proximal joint enhancer (PJE) [4]. For each species, portions of the mouse reference sequence that align to that species’ sequence are indicated by green and red bars (reflecting regions with >50 or >75% identity with the mouse sequence, respectively). Gray bars indicate known gaps in the sequence data that are greater than 1 kb. (c) UCSC Genome Browser-based view depicting the positions of MCSs around the mouse Gdf6 gene (mm4/NCBI build 32, October 2003; shown is the interval chr4:9,641,000–9,850,732, which corresponds to bases 50,001–209,733 of mouse BAC RP23-117O7; GenBank No. AC058786). The top 10 tracks (labeled ‘‘EP’’) depict the positions of MCSs detected with ExactPlus; these are labeled using the format ‘‘EP: #-#-#,’’ in which the three numbers indicate the initial seed length (in bases),
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